<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        function ask(question) {
        if (confirm(question)) showOk()
        else showCancel();
        }

        function showOk() {
        alert( "You agreed." );
        }

        function showCancel() {
        alert( "You canceled the execution." );
        }

        // usage: functions showOk, showCancel are passed as arguments to ask
        ask("Do you agree?" );
    </script>
</body>
</html>